Sports Medicine Fellowship Faculty

Nathan Cardoos, MD, CAQSM

Assistant Professor

Fellowship Director


Dr. Cardoos is an assistant professor in family medicine and primary care sports medicine. He serves as both the director of the Boston University Primary Care Sports Medicine Fellowship and the medical director of the Ryan Center for Sports Medicine. Nathan completed his undergraduate degree at Williams College and then attended medical school at the University of Chicago Pritzker School of Medicine. In medical school, he was elected by his peers to the Gold Humanism Honor Society, an organization that recognizes humanistic patient care and leadership in medicine. He completed residency at the Tufts University Family Medicine Residency Program at Cambridge Health Alliance, where he received awards for his dedication to patient care and for teaching. He then completed a primary care sports medicine fellowship at the University of Massachusetts. Nathan joined the Department of Family Medicine at BMC in August 2015 and initially worked as a primary care provider in addition to his sports medicine practice until being named fellowship director. At the Ryan Center for Sports Medicine, he provides care to sports medicine patients and has a special interest in sports ultrasound. Using ultrasound guidance, he performs procedures such as corticosteroid injections, viscosupplementation, platelet rich plasma therapy, tenotomy/needle fenestration, aspiration and barbotage. He also performs extracorporeal shockwave therapy/EPAT. Nathan serves as a team physician for Boston University. He is a member of the American Medical Society for Sports Medicine and serves on the education and fellowship committees.


Alysia L. Green, MD, CAQSM
Assistant Professor

Assistant Fellowship Director


Dr. Green was born and raised in Michigan, receiving her Bachelors of Science in biology from the University of Michigan. She is a proud Michigan Alumnae and die-hard Michigan fan. She attended Wayne State School of Medicine in Detroit, MI, where she received her Doctor of Medicine and completed her residency in family medicine at Case University-University Hospitals of Cleveland. Following residency, she went on to do a sports medicine fellowship at Michigan State University. Dr. Green is a board-certified family physician with a certificate of added qualification in sports medicine. She is an assistant professor of family medicine/primary care sports medicine, as well as the assistant director of the primary care sports medicine fellowship. She works at the Ryan Center for Sports Medicine, BMC’s orthopedic clinic, South Boston Community Health Center, and serves as the head team physician at Boston University. She is a former head team physician for USA Gymnastics. Special interests include medical education, the female athlete, concussion and infectious diseases.


Christopher Ma, MD, CAQSM

Assistant Professor


Dr. Ma is an assistant professor in primary care sports medicine. He received his bachelors in biomedical engineering at Syracuse University. He attended SUNY Upstate Medical University for medical school. He completed a general surgery internship at Temple University Health System and family medicine residency training at University of Vermont Medical Center. He then completed a fellowship in primary care sports medicine at Boston University where he joined the faculty in January 2020. He currently sees patients at the Ryan Center for Sports Medicine, Winthrop Specialty Clinic, and BU student health services. He is also a team physician for BU and Boston Public Schools. Clinical interests include non-operative fracture management, tendon pathology, injection therapy such as corticosteroid, viscosupplementation, and platelet rich plasma, and procedures such as tenotomy, aspiration and barbotage, and EPAT therapy. Research interests include shoulder and knee biomechanics, musculoskeletal ultrasound, and regenerative medicine and orthobiologics for musculoskeletal pathology.


Douglas W. Comeau, DO, CAQSM, FAAFP
Clinical Associate Professor


Dr. Doug Comeau is a clinical associate professor in family medicine and serves as the director of Boston College University Health Services and Primary Care Sports Medicine.  He serves as the head primary care team physician for Boston College. He is the former director of the fellowship program from 2013 to 2020. He attended medical school at UNECOM in Biddeford, ME and completed his family medicine residency at Tufts University, where he was administrative chief resident during his third year. He then completed a primary care sports medicine fellowship at Wake Forest University. He joined the family medicine department at BMC in July 2007. His special interests include osteopathic manipulation, concussion management and rehabilitation of musculoskeletal injuries. Dr. Comeau currently serves as co-director of the cases sub-committee for the AMSSM Education Committee and Massachusetts state representative for the AMSSM Policy and Practice Committee. Dr. Comeau is an avid Boston sports fan and also enjoys golf. He currently resides in Melrose with his wife, Rainelle, and daughters, Charlotte and Natalie.